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Question

If a and b are real numbers, find the value of b, if (a+b)+5i=9+ai and given that i2=−1

A
4
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B
5
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C
9
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D
4+5i
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E
5+4i
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Solution

The correct option is A 4
Given, (a+b)+5i=9+ai
Equating the real and imaginary parts, we get
a+b=9,a=5
Put a=5 in a+b=9
5+b=9
b=4

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